package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptot implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptot(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1.获取请求头中的token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            return true;
        }
        // 2.基于Token获取redis里面的对象，判断用户是否存在
        String key = RedisConstants.LOGIN_USER_KEY+token;
        Map<Object,Object> userMap = stringRedisTemplate.opsForHash().entries(key);
        if(userMap.isEmpty()){
            return true;
        }
        // 4.将HashMap转换为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap,new UserDTO(),false);
        // 5.存在就用ThreadLocal存储
        UserHolder.saveUser(userDTO);
        // 6.刷新token有效期
        stringRedisTemplate.expire(key,RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 7.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 移除用户
        UserHolder.removeUser();
    }
}